Quad shadows

core/src/border.rs

@@ -0,0 +1,54 @@
+//! Draw lines around containers.
+use crate::Color;
+
+/// A border.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct Border {
+    /// The color of the border.
+    pub color: Color,
+
+    /// The width of the border.
+    pub width: f32,
+
+    /// The radius of the border.
+    pub radius: Radius,
+}
+
+impl Border {
+    /// Creates a new default [`Border`] with the given [`Radius`].
+    pub fn with_radius(radius: impl Into<Radius>) -> Self {
+        Self {
+            radius: radius.into(),
+            ..Self::default()
+        }
+    }
+}
+
+/// The border radii for the corners of a graphics primitive in the order:
+/// top-left, top-right, bottom-right, bottom-left.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct Radius([f32; 4]);
+
+impl From<f32> for Radius {
+    fn from(w: f32) -> Self {
+        Self([w; 4])
+    }
+}
+
+impl From<u8> for Radius {
+    fn from(w: u8) -> Self {
+        Self([f32::from(w); 4])
+    }
+}
+
+impl From<[f32; 4]> for Radius {
+    fn from(radi: [f32; 4]) -> Self {
+        Self(radi)
+    }
+}
+
+impl From<Radius> for [f32; 4] {
+    fn from(radi: Radius) -> Self {
+        radi.0
+    }
+}

core/src/element.rs

@@ -6,7 +6,8 @@ use crate::renderer;
 use crate::widget;
 use crate::widget::tree::{self, Tree};
 use crate::{
-    Clipboard, Color, Layout, Length, Rectangle, Shell, Size, Vector, Widget,
+    Border, Clipboard, Color, Layout, Length, Rectangle, Shell, Size, Vector,
+    Widget,
 };
 
 use std::any::Any;
@@ -537,9 +538,12 @@ where
             renderer.fill_quad(
                 renderer::Quad {
                     bounds: layout.bounds(),
-                    border_color: color,
-                    border_width: 1.0,
-                    border_radius: 0.0.into(),
+                    border: Border {
+                        color,
+                        width: 1.0,
+                        ..Border::default()
+                    },
+                    ..renderer::Quad::default()
                 },
                 Color::TRANSPARENT,
             );

core/src/lib.rs

@@ -17,6 +17,7 @@
     rustdoc::broken_intra_doc_links
 )]
 pub mod alignment;
+pub mod border;
 pub mod clipboard;
 pub mod event;
 pub mod font;
@@ -36,7 +37,6 @@ pub mod window;
 
 mod angle;
 mod background;
-mod border_radius;
 mod color;
 mod content_fit;
 mod element;
@@ -46,14 +46,15 @@ mod padding;
 mod pixels;
 mod point;
 mod rectangle;
+mod shadow;
 mod shell;
 mod size;
 mod vector;
 
 pub use alignment::Alignment;
 pub use angle::{Degrees, Radians};
 pub use background::Background;
-pub use border_radius::BorderRadius;
+pub use border::Border;
 pub use clipboard::Clipboard;
 pub use color::Color;
 pub use content_fit::ContentFit;
@@ -70,6 +71,7 @@ pub use pixels::Pixels;
 pub use point::Point;
 pub use rectangle::Rectangle;
 pub use renderer::Renderer;
+pub use shadow::Shadow;
 pub use shell::Shell;
 pub use size::Size;
 pub use text::Text;

core/src/renderer.rs

@@ -5,7 +5,7 @@ mod null;
 #[cfg(debug_assertions)]
 pub use null::Null;
 
-use crate::{Background, BorderRadius, Color, Rectangle, Vector};
+use crate::{Background, Border, Color, Rectangle, Shadow, Size, Vector};
 
 /// A component that can be used by widgets to draw themselves on a screen.
 pub trait Renderer: Sized {
@@ -37,14 +37,21 @@ pub struct Quad {
     /// The bounds of the [`Quad`].
     pub bounds: Rectangle,
 
-    /// The border radius of the [`Quad`].
-    pub border_radius: BorderRadius,
+    /// The [`Border`] of the [`Quad`].
+    pub border: Border,
 
-    /// The border width of the [`Quad`].
-    pub border_width: f32,
+    /// The [`Shadow`] of the [`Quad`].
+    pub shadow: Shadow,
+}
 
-    /// The border color of the [`Quad`].
-    pub border_color: Color,
+impl Default for Quad {
+    fn default() -> Self {
+        Self {
+            bounds: Rectangle::with_size(Size::ZERO),
+            border: Border::default(),
+            shadow: Shadow::default(),
+        }
+    }
 }
 
 /// The styling attributes of a [`Renderer`].

core/src/shadow.rs

@@ -0,0 +1,14 @@
+use crate::{Color, Vector};
+
+/// A shadow.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct Shadow {
+    /// The color of the shadow.
+    pub color: Color,
+
+    /// The offset of the shadow.
+    pub offset: Vector,
+
+    /// The blur radius of the shadow.
+    pub blur_radius: f32,
+}

examples/custom_quad/src/main.rs

@@ -4,20 +4,27 @@ mod quad {
     use iced::advanced::renderer;
     use iced::advanced::widget::{self, Widget};
     use iced::mouse;
-    use iced::{Color, Element, Length, Rectangle, Size};
+    use iced::{Border, Color, Element, Length, Rectangle, Shadow, Size};
 
     pub struct CustomQuad {
         size: f32,
         radius: [f32; 4],
         border_width: f32,
+        shadow: Shadow,
     }
 
     impl CustomQuad {
-        pub fn new(size: f32, radius: [f32; 4], border_width: f32) -> Self {
+        pub fn new(
+            size: f32,
+            radius: [f32; 4],
+            border_width: f32,
+            shadow: Shadow,
+        ) -> Self {
             Self {
                 size,
                 radius,
                 border_width,
+                shadow,
             }
         }
     }
@@ -55,9 +62,12 @@ mod quad {
             renderer.fill_quad(
                 renderer::Quad {
                     bounds: layout.bounds(),
-                    border_radius: self.radius.into(),
-                    border_width: self.border_width,
-                    border_color: Color::from_rgb(1.0, 0.0, 0.0),
+                    border: Border {
+                        radius: self.radius.into(),
+                        width: self.border_width,
+                        color: Color::from_rgb(1.0, 0.0, 0.0),
+                    },
+                    shadow: self.shadow,
                 },
                 Color::BLACK,
             );
@@ -75,7 +85,9 @@ mod quad {
 }
 
 use iced::widget::{column, container, slider, text};
-use iced::{Alignment, Element, Length, Sandbox, Settings};
+use iced::{
+    Alignment, Color, Element, Length, Sandbox, Settings, Shadow, Vector,
+};
 
 pub fn main() -> iced::Result {
     Example::run(Settings::default())
@@ -84,6 +96,7 @@ pub fn main() -> iced::Result {
 struct Example {
     radius: [f32; 4],
     border_width: f32,
+    shadow: Shadow,
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -94,6 +107,9 @@ enum Message {
     RadiusBottomRightChanged(f32),
     RadiusBottomLeftChanged(f32),
     BorderWidthChanged(f32),
+    ShadowXOffsetChanged(f32),
+    ShadowYOffsetChanged(f32),
+    ShadowBlurRadiusChanged(f32),
 }
 
 impl Sandbox for Example {
@@ -103,6 +119,11 @@ impl Sandbox for Example {
         Self {
             radius: [50.0; 4],
             border_width: 0.0,
+            shadow: Shadow {
+                color: Color::from_rgba(0.0, 0.0, 0.0, 0.8),
+                offset: Vector::new(0.0, 8.0),
+                blur_radius: 16.0,
+            },
         }
     }
 
@@ -128,14 +149,33 @@ impl Sandbox for Example {
             Message::BorderWidthChanged(width) => {
                 self.border_width = width;
             }
+            Message::ShadowXOffsetChanged(x) => {
+                self.shadow.offset.x = x;
+            }
+            Message::ShadowYOffsetChanged(y) => {
+                self.shadow.offset.y = y;
+            }
+            Message::ShadowBlurRadiusChanged(s) => {
+                self.shadow.blur_radius = s;
+            }
         }
     }
 
     fn view(&self) -> Element<Message> {
         let [tl, tr, br, bl] = self.radius;
+        let Shadow {
+            offset: Vector { x: sx, y: sy },
+            blur_radius: sr,
+            ..
+        } = self.shadow;
 
         let content = column![
-            quad::CustomQuad::new(200.0, self.radius, self.border_width),
+            quad::CustomQuad::new(
+                200.0,
+                self.radius,
+                self.border_width,
+                self.shadow
+            ),
             text(format!("Radius: {tl:.2}/{tr:.2}/{br:.2}/{bl:.2}")),
             slider(1.0..=100.0, tl, Message::RadiusTopLeftChanged).step(0.01),
             slider(1.0..=100.0, tr, Message::RadiusTopRightChanged).step(0.01),
@@ -145,6 +185,13 @@ impl Sandbox for Example {
                 .step(0.01),
             slider(1.0..=10.0, self.border_width, Message::BorderWidthChanged)
                 .step(0.01),
+            text(format!("Shadow: {sx:.2}x{sy:.2}, {sr:.2}")),
+            slider(-100.0..=100.0, sx, Message::ShadowXOffsetChanged)
+                .step(0.01),
+            slider(-100.0..=100.0, sy, Message::ShadowYOffsetChanged)
+                .step(0.01),
+            slider(0.0..=100.0, sr, Message::ShadowBlurRadiusChanged)
+                .step(0.01),
         ]
         .padding(20)
         .spacing(20)

examples/custom_widget/src/main.rs

@@ -13,7 +13,7 @@ mod circle {
     use iced::advanced::renderer;
     use iced::advanced::widget::{self, Widget};
     use iced::mouse;
-    use iced::{Color, Element, Length, Rectangle, Size};
+    use iced::{Border, Color, Element, Length, Rectangle, Size};
 
     pub struct Circle {
         radius: f32,
@@ -62,9 +62,8 @@ mod circle {
             renderer.fill_quad(
                 renderer::Quad {
                     bounds: layout.bounds(),
-                    border_radius: self.radius.into(),
-                    border_width: 0.0,
-                    border_color: Color::TRANSPARENT,
+                    border: Border::with_radius(self.radius),
+                    ..renderer::Quad::default()
                 },
                 Color::BLACK,
             );

examples/loading_spinners/src/linear.rs

@@ -225,9 +225,7 @@ where
                     width: bounds.width,
                     height: bounds.height,
                 },
-                border_radius: 0.0.into(),
-                border_width: 0.0,
-                border_color: Color::TRANSPARENT,
+                ..renderer::Quad::default()
             },
             Background::Color(custom_style.track_color),
         );
@@ -241,9 +239,7 @@ where
                         width: self.easing.y_at_x(*progress) * bounds.width,
                         height: bounds.height,
                     },
-                    border_radius: 0.0.into(),
-                    border_width: 0.0,
-                    border_color: Color::TRANSPARENT,
+                    ..renderer::Quad::default()
                 },
                 Background::Color(custom_style.bar_color),
             ),
@@ -258,9 +254,7 @@ where
                             * bounds.width,
                         height: bounds.height,
                     },
-                    border_radius: 0.0.into(),
-                    border_width: 0.0,
-                    border_color: Color::TRANSPARENT,
+                    ..renderer::Quad::default()
                 },
                 Background::Color(custom_style.bar_color),
             ),
@@ -288,7 +282,7 @@ pub struct Appearance {
     pub bar_color: Color,
 }
 
-impl std::default::Default for Appearance {
+impl Default for Appearance {
     fn default() -> Self {
         Self {
             track_color: Color::TRANSPARENT,

examples/modal/src/main.rs

@@ -231,10 +231,7 @@ mod modal {
     use iced::alignment::Alignment;
     use iced::event;
     use iced::mouse;
-    use iced::{
-        BorderRadius, Color, Element, Event, Length, Point, Rectangle, Size,
-        Vector,
-    };
+    use iced::{Color, Element, Event, Length, Point, Rectangle, Size, Vector};
 
     /// A widget that centers a modal element over some base element
     pub struct Modal<'a, Message, Renderer> {
@@ -474,9 +471,7 @@ mod modal {
             renderer.fill_quad(
                 renderer::Quad {
                     bounds: layout.bounds(),
-                    border_radius: BorderRadius::default(),
-                    border_width: 0.0,
-                    border_color: Color::TRANSPARENT,
+                    ..renderer::Quad::default()
                 },
                 Color {
                     a: 0.80,